EASY
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Detergents give froth (foam) in both soft and hard water.

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Important Questions on Water

EASY
Science>Chemistry>Water>Soft and Hard Water
The temporary hardness of water is due to:
EASY
Science>Chemistry>Water>Soft and Hard Water
Water which forms scum with soap is called
MEDIUM
Science>Chemistry>Water>Soft and Hard Water
Write any two disadvantages of using hard water.
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Science>Chemistry>Water>Soft and Hard Water
Differentiate hard and soft water with example.
MEDIUM
Science>Chemistry>Water>Soft and Hard Water
What is hard water? How is it different from soft water?
EASY
Science>Chemistry>Water>Soft and Hard Water
Hard water can block radiators due to the formation of
MEDIUM
Science>Chemistry>Water>Soft and Hard Water
Which of the following salt when dissolved in water produce hard water?
EASY
Science>Chemistry>Water>Soft and Hard Water
Which one of the following processes will produce hard water ?
EASY
Science>Chemistry>Water>Soft and Hard Water
Hard water can block radiators due to the formation of
HARD
Science>Chemistry>Water>Soft and Hard Water
Which of the following salts when dissolved in water produces hard water?
EASY
Science>Chemistry>Water>Soft and Hard Water
In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following groups of salts available in your school, a group, each member of which, if dissolved in distilled water, will make it hard:
EASY
Science>Chemistry>Water>Soft and Hard Water
Hard water required for an experiment is not available in a school laboratory. However, the following salts are available in the laboratory. Select the salt which may be dissolved in water to make it hard for the experiment. 
(i). Calcium sulphate
(ii). Sodium sulphate
(iii). Calcium chloride
(iv). Potassium sulphate
(v). Sodium hydrogen carbonate
(vi). Magnesium chloride
MEDIUM
Science>Chemistry>Water>Soft and Hard Water
Hard water can block radiators due to the formation of
EASY
Science>Chemistry>Water>Soft and Hard Water
Write any one disadvantage of using hard water.
EASY
Science>Chemistry>Water>Soft and Hard Water

Which of the following pairs of ions make the water hard?

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Science>Chemistry>Water>Soft and Hard Water
Distinguish between hard and soft water?
EASY
Science>Chemistry>Water>Soft and Hard Water
A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts a group each salt of which when dissolved in distilled water will make it hard:
EASY
Science>Chemistry>Water>Soft and Hard Water

Which one of the following processes will produce hard water?

MEDIUM
Science>Chemistry>Water>Soft and Hard Water
Natural water is
EASY
Science>Chemistry>Water>Soft and Hard Water
Hard water is not available for an experiment. Some salts are given below:
(i) Sodium chloride
(ii) Sodium sulphate
(iii) Calcium chloride
(iv) Calcium sulphate
(v) Potassium chloride
(vi) Magnesium sulphate
Select from the following a group of these salts, each member of which may be dissolved in water to make it hard.